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Question

A sol has positively charged colloidal particles. Which of the following solutions is required in lowest concentration for coagulation -


A

NaCl

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B

K4[Fe(CN)6]

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C

ZnCl2

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D

Na2SO4

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Solution

The correct option is B

K4[Fe(CN)6]


Positively charged colloidal particles can be coagulated by negatively charged anions, higher the charge on anion, lower the concentration required I.e, [Fe(CN)6]4


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